Diffusion and Osmosis

Question 1

What is Diffusion

Answer 1

Diffusion is the spreading of molecules from areas of high concentration to areas of low concentration. Passive

Question 2

What is Active Transport

Answer 2

Movement of molecules from a low concentration to a high concentration area requires energy

Question 3

What is a concentration gradient

Answer 3

The gradual change in the concentration of solutes present in a solution

Question 4

Selectively permeable

Answer 4

Allows some substances through, and not others

Question 5

Osmosis

Answer 5

special type of diffusion movement of water molecules across a semipermeable membrane from a area of high water concentration to a region of low water concentration

Question 6

What is a solvent

Answer 6

Liquid that dissolved other substances

Question 7

What is a solute

Answer 7

Substance that has been dissolved

Question 8

Solution

Answer 8

Solution is a mixture of solute and solvent

Question 9

What will animal cells do in higher water concentration

Answer 9

Swell and burst

Question 10

How do plants remain turgid pressure

Answer 10

Outward pressure of cytoplasm and vacuole against the cell wall

Question 11

What condition occurs when plants lose turgor pressure and become limp

Answer 11

Plasmolysis

Question 12

What type of concentration do amoeba have

Answer 12

Lower water concentration

Question 13

What stops the amoeba from bursting in high water conditions

Answer 13

Contractile vacuole collects excess water and pushes it out the amoeba
(Osmoregulation)

Question 14

Name a application of osmosis in food preservation

Answer 14

Lower water conditions can cause bacterial and fungal cells to shrivel up and die (jam)

Question 15

How do you demonstrate osmosis in the lab?

Answer 15

Visking tubing is made up of a plastic that resembles the membrane of a cell.Visking tubing has a strong sugar solution, placed in a container of water causes water to move through the tubing by osmosis, causing it to swell, leave for 60 mins

Question 16

Observations of the Osmosis experiment

Answer 16

The piece of Visking tubing with sucrose solution is more turgid and heavier.water has moved into it by osmosis along its concentration gradient